Fix BaseModelAdmin.get_inlines() return type (#2576)

* fix return types for BaseModelAdmin and ModelAdmin

* fix return types for BaseModelAdmin and ModelAdmin to _ListOrTuple

Author: MaestroXXXVIII

django-stubs/contrib/admin/options.pyi

@@ -125,7 +125,7 @@ class BaseModelAdmin(Generic[_ModelT]):
     def get_exclude(self, request: HttpRequest, obj: _ModelT | None = ...) -> _ListOrTuple[str] | None: ...
     def get_fields(self, request: HttpRequest, obj: _ModelT | None = ...) -> _FieldGroups: ...
     def get_fieldsets(self, request: HttpRequest, obj: _ModelT | None = ...) -> _FieldsetSpec: ...
-    def get_inlines(self, request: HttpRequest, obj: _ModelT | None) -> list[type[InlineModelAdmin]]: ...
+    def get_inlines(self, request: HttpRequest, obj: _ModelT | None) -> _ListOrTuple[type[InlineModelAdmin]]: ...
     def get_ordering(self, request: HttpRequest) -> _ListOrTuple[str]: ...
     def get_readonly_fields(self, request: HttpRequest, obj: _ModelT | None = ...) -> _ListOrTuple[str]: ...
     def get_prepopulated_fields(self, request: HttpRequest, obj: _ModelT | None = ...) -> dict[str, Sequence[str]]: ...